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Future Policy Benefits and Claims - Discounting Table (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims | $ 1,240.3 |  |
Aggregate amount of discount | $ 226.6 |  |
Short-Duration Insurance Contract, Discounted Liability, Interest Accretion, Statement of Income or Comprehensive Income [Extensible Enumeration] | Policyholder Benefits and Claims Incurred, Net | Policyholder Benefits and Claims Incurred, Net | Policyholder Benefits and Claims Incurred, Net
Long-Term Disability/Group Life Waiver |  |  |
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims | $ 1,062.1 | $ 1,082.6 |
Aggregate amount of discount | 226.6 | 215.0 |
Interest accretion | $ 34.7 | $ 34.7 | $ 33.0
Long-Term Disability/Group Life Waiver | Minimum |  |  |
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Discount rate | 2.80% | 2.80% |
Long-Term Disability/Group Life Waiver | Maximum |  |  |
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Discount rate | 7.00% | 7.00% |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML |  |  |
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims | $ 94.3 | $ 83.7 |
Group Life |  |  |
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items] |  |  |
Carrying amount of liabilities for unpaid claims | $ 83.9 | $ 97.1 |

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